Cleanup: spelling in comments

Also replace "dm" for evaluated mesh in some comments.

intern/cycles/util/math_fast.h

@@ -589,7 +589,7 @@ ccl_device_inline float fast_erfcf(float x)
 ccl_device_inline float fast_ierff(float x)
 {
   /* From: Approximating the `erfinv` function by Mike Giles. */
-  /* To avoid trouble at the limit, clamp input to 1-eps. */
+  /* To avoid trouble at the limit, clamp input to 1-epsilon. */
   float a = fabsf(x);
   if (a > 0.99999994f) {
     a = 0.99999994f;

intern/ghost/intern/GHOST_SystemX11.h

@@ -14,7 +14,7 @@
 #include "../GHOST_Types.h"
 #include "GHOST_System.h"
 
-// For tablets
+/* For tablets. */
 #ifdef WITH_X11_XINPUT
 #  include <X11/extensions/XInput.h>
 

intern/ghost/intern/GHOST_WindowX11.cpp

@@ -25,18 +25,18 @@
 #include "GHOST_ContextEGL.h"
 #include "GHOST_ContextGLX.h"
 
-/* for XIWarpPointer */
+/* For #XIWarpPointer. */
 #ifdef WITH_X11_XINPUT
 #  include <X11/extensions/XInput2.h>
 #endif
 
-// For DPI value
+/* For DPI value. */
 #include <X11/Xresource.h>
 
 #include <cstdio>
 #include <cstring>
 
-/* gethostname */
+/* For `gethostname`. */
 #include <unistd.h>
 
 #include <algorithm>

intern/ghost/intern/GHOST_WindowX11.h

@@ -11,7 +11,7 @@
 #include "GHOST_Window.h"
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
-// For tablets
+/* For tablets. */
 #ifdef WITH_X11_XINPUT
 #  include <X11/extensions/XInput.h>
 #endif

intern/ghost/intern/GHOST_XrGraphicsBinding.cpp

@@ -85,7 +85,7 @@ class GHOST_XrGraphicsBindingOpenGL : public GHOST_IXrGraphicsBinding {
     XrGraphicsRequirementsOpenGLKHR gpu_requirements = {XR_TYPE_GRAPHICS_REQUIREMENTS_OPENGL_KHR};
     const XrVersion gl_version = XR_MAKE_VERSION(gl_major_version, gl_minor_version, 0);
 
-    /* Although it would seem reasonable that the proc address would not change if the instance was
+    /* Although it would seem reasonable that the PROC address would not change if the instance was
      * the same, in testing, repeated calls to #xrGetInstanceProcAddress() with the same instance
      * can still result in changes so the workaround is to simply set the function pointer every
      * time (trivializing its 'static' designation). */
@@ -343,7 +343,7 @@ class GHOST_XrGraphicsBindingD3D : public GHOST_IXrGraphicsBinding {
     // static XrInstance s_instance = XR_NULL_HANDLE;
     XrGraphicsRequirementsD3D11KHR gpu_requirements = {XR_TYPE_GRAPHICS_REQUIREMENTS_D3D11_KHR};
 
-    /* Although it would seem reasonable that the proc address would not change if the instance was
+    /* Although it would seem reasonable that the PROC address would not change if the instance was
      * the same, in testing, repeated calls to #xrGetInstanceProcAddress() with the same instance
      * can still result in changes so the workaround is to simply set the function pointer every
      * time (trivializing its 'static' designation). */

source/blender/blenkernel/intern/editmesh.cc

@@ -59,7 +59,7 @@ BMEditMesh *BKE_editmesh_from_object(Object *ob)
 {
   BLI_assert(ob->type == OB_MESH);
   /* sanity check */
-#if 0 /* disable in mutlti-object edit. */
+#if 0 /* disable in multi-object edit. */
 #  ifndef NDEBUG
   if (((Mesh *)ob->data)->edit_mesh) {
     BLI_assert(((Mesh *)ob->data)->edit_mesh->ob == ob);
@@ -85,9 +85,9 @@ static void editmesh_tessface_calc_intern(BMEditMesh *em,
 
   BMLoop *(*looptris)[3];
 
-  /* this means no reallocs for quad dominant models, for */
+  /* This means no reallocations for quad dominant models. */
   if ((em->looptris != nullptr) &&
-      /* (*em->tottri >= looptris_tot)) */
+      // (*em->tottri >= looptris_tot))
       /* Check against allocated size in case we over allocated a little. */
       ((looptris_tot_prev_alloc >= looptris_tot) &&
        (looptris_tot_prev_alloc <= looptris_tot * 2))) {

source/blender/blenkernel/intern/mball_tessellate.cc

@@ -46,44 +46,52 @@
 
 /* Data types */
 
-typedef struct corner { /* corner of a cube */
-  int i, j, k;          /* (i, j, k) is index within lattice */
-  float co[3], value;   /* location and function value */
+/** Corner of a cube. */
+typedef struct corner {
+  int i, j, k;        /* (i, j, k) is index within lattice */
+  float co[3], value; /* location and function value */
   struct corner *next;
 } CORNER;
 
-typedef struct cube { /* partitioning cell (cube) */
+/** Partitioning cell (cube). */
+typedef struct cube {
   int i, j, k;        /* lattice location of cube */
   CORNER *corners[8]; /* eight corners */
 } CUBE;
 
-typedef struct cubes { /* linked list of cubes acting as stack */
-  CUBE cube;           /* a single cube */
-  struct cubes *next;  /* remaining elements */
+/** Linked list of cubes acting as stack. */
+typedef struct cubes {
+  CUBE cube;          /* a single cube */
+  struct cubes *next; /* remaining elements */
 } CUBES;
 
-typedef struct centerlist { /* list of cube locations */
-  int i, j, k;              /* cube location */
-  struct centerlist *next;  /* remaining elements */
+/** List of cube locations. */
+typedef struct centerlist {
+  int i, j, k;             /* cube location */
+  struct centerlist *next; /* remaining elements */
 } CENTERLIST;
 
-typedef struct edgelist {     /* list of edges */
+/** List of edges. */
+typedef struct edgelist {
   int i1, j1, k1, i2, j2, k2; /* edge corner ids */
   int vid;                    /* vertex id */
   struct edgelist *next;      /* remaining elements */
 } EDGELIST;
 
-typedef struct intlist { /* list of integers */
-  int i;                 /* an integer */
-  struct intlist *next;  /* remaining elements */
+/** List of integers. */
+typedef struct intlist {
+  int i;                /* an integer */
+  struct intlist *next; /* remaining elements */
 } INTLIST;
 
-typedef struct intlists { /* list of list of integers */
-  INTLIST *list;          /* a list of integers */
-  struct intlists *next;  /* remaining elements */
+/** List of list of integers. */
+typedef struct intlists {
+  INTLIST *list;         /* a list of integers */
+  struct intlists *next; /* remaining elements */
 } INTLISTS;
 
-typedef struct Box { /* an AABB with pointer to metalelem */
+/** An AABB with pointer to metal-elem. */
+typedef struct Box {
   float min[3], max[3];
   const MetaElem *ml;
 } Box;
@@ -93,16 +101,17 @@ typedef struct MetaballBVHNode { /* BVH node */
   struct MetaballBVHNode *child[2];
 } MetaballBVHNode;
 
-typedef struct process { /* parameters, storage */
-  float thresh, size;    /* mball threshold, single cube size */
-  float delta;           /* small delta for calculating normals */
-  uint converge_res;     /* converge procedure resolution (more = slower) */
+/** Parameters, storage. */
+typedef struct process {
+  float thresh, size; /* mball threshold, single cube size */
+  float delta;        /* small delta for calculating normals */
+  uint converge_res;  /* converge procedure resolution (more = slower) */
 
-  MetaElem **mainb;  /* array of all metaelems */
-  uint totelem, mem; /* number of metaelems */
+  MetaElem **mainb;  /* array of all meta-elems. */
+  uint totelem, mem; /* number of meta-elems. */
 
   MetaballBVHNode metaball_bvh; /* The simplest bvh */
-  Box allbb;                    /* Bounding box of all metaelems */
+  Box allbb;                    /* Bounding box of all meta-elems */
 
   MetaballBVHNode **bvh_queue; /* Queue used during bvh traversal */
   uint bvh_queue_size;
@@ -1127,8 +1136,8 @@ static void find_first_points(PROCESS *process, const uint em)
 }
 
 /**
- * The main polygonization proc.
- * Allocates memory, makes cubetable,
+ * The main polygonization processing function.
+ * Allocates memory, makes cube-table,
  * finds starting surface points
  * and processes cubes on the stack until none left.
  */
@@ -1341,18 +1350,18 @@ static void init_meta(Depsgraph *depsgraph, PROCESS *process, Scene *scene, Obje
             copy_v3_fl3(new_ml->bb->vec[6], +expx, +expy, +expz); /* 6 */
             copy_v3_fl3(new_ml->bb->vec[7], -expx, +expy, +expz); /* 7 */
 
-            /* transformation of Metalem bb */
+            /* Transformation of meta-elem bounding-box. */
             for (i = 0; i < 8; i++) {
               mul_m4_v3((float(*)[4])new_ml->mat, new_ml->bb->vec[i]);
             }
 
-            /* find max and min of transformed bb */
+            /* Find max and min of transformed bounding-box. */
             INIT_MINMAX(tempmin, tempmax);
             for (i = 0; i < 8; i++) {
               DO_MINMAX(new_ml->bb->vec[i], tempmin, tempmax);
             }
 
-            /* set only point 0 and 6 - AABB of Metaelem */
+            /* Set only point 0 and 6 - AABB of meta-elem. */
             copy_v3_v3(new_ml->bb->vec[0], tempmin);
             copy_v3_v3(new_ml->bb->vec[6], tempmax);
 
@@ -1370,7 +1379,7 @@ static void init_meta(Depsgraph *depsgraph, PROCESS *process, Scene *scene, Obje
     }
   }
 
-  /* compute AABB of all Metaelems */
+  /* Compute AABB of all meta-elems. */
   if (process->totelem > 0) {
     copy_v3_v3(process->allbb.min, process->mainb[0]->bb->vec[0]);
     copy_v3_v3(process->allbb.max, process->mainb[0]->bb->vec[6]);
@@ -1432,8 +1441,8 @@ Mesh *BKE_mball_polygonize(Depsgraph *depsgraph, Scene *scene, Object *ob)
 
   build_bvh_spatial(&process, &process.metaball_bvh, 0, process.totelem, &process.allbb);
 
-  /* Don't polygonize meta-balls with too high resolution (base mball too small)
-   * NOTE: Eps was 0.0001f but this was giving problems for blood animation for
+  /* Don't polygonize meta-balls with too high resolution (base meta-ball too small).
+   * NOTE: Epsilon was 0.0001f but this was giving problems for blood animation for
    * the open movie "Sintel", using 0.00001f. */
   if (ob->scale[0] < 0.00001f * (process.allbb.max[0] - process.allbb.min[0]) ||
       ob->scale[1] < 0.00001f * (process.allbb.max[1] - process.allbb.min[1]) ||

source/blender/blenkernel/intern/mesh_iterators.cc

@@ -151,9 +151,9 @@ void BKE_mesh_foreach_mapped_loop(Mesh *mesh,
                                   MeshForeachFlag flag)
 {
 
-  /* We can't use dm->getLoopDataLayout(dm) here,
-   * we want to always access dm->loopData, EditDerivedBMesh would
-   * return loop data from bmesh itself. */
+  /* We can't use `dm->getLoopDataLayout(dm)` here,
+   * we want to always access `dm->loopData`, `EditDerivedBMesh` would
+   * return loop data from BMesh itself. */
   if (mesh->edit_mesh != nullptr && mesh->runtime.edit_data) {
     BMEditMesh *em = mesh->edit_mesh;
     BMesh *bm = em->bm;

source/blender/blenkernel/intern/modifier.cc

@@ -253,7 +253,7 @@ bool BKE_modifier_is_preview(ModifierData *md)
 {
   const ModifierTypeInfo *mti = BKE_modifier_get_info(ModifierType(md->type));
 
-  /* Constructive modifiers are highly likely to also modify data like vgroups or vcol! */
+  /* Constructive modifiers are highly likely to also modify data like vgroups or vertex-colors! */
   if (!((mti->flags & eModifierTypeFlag_UsesPreview) ||
         (mti->type == eModifierTypeType_Constructive))) {
     return false;
@@ -340,8 +340,8 @@ void BKE_modifier_copydata_generic(const ModifierData *md_src,
 {
   const ModifierTypeInfo *mti = BKE_modifier_get_info(ModifierType(md_src->type));
 
-  /* md_dst may have already be fully initialized with some extra allocated data,
-   * we need to free it now to avoid memleak. */
+  /* `md_dst` may have already be fully initialized with some extra allocated data,
+   * we need to free it now to avoid a memory leak. */
   if (mti->freeData) {
     mti->freeData(md_dst);
   }

source/blender/blenlib/intern/noise.c

@@ -1329,8 +1329,8 @@ float BLI_noise_mg_fbm(
 float BLI_noise_mg_multi_fractal(
     float x, float y, float z, float H, float lacunarity, float octaves, int noisebasis)
 {
-  /* This one is in fact rather confusing,
-   * there seem to be errors in the original source code (in all three versions of proc.text&mod),
+  /* This one is in fact rather confusing, there seem to be errors in the original source code
+   * (in all three versions of `proc.text & mod`),
    * I modified it to something that made sense to me, so it might be wrong. */
 
   float (*noisefunc)(float, float, float);

source/blender/bmesh/operators/bmo_removedoubles.c

@@ -563,7 +563,7 @@ static void bmo_collapsecon_do_layer(BMesh *bm, const int layer, const short ofl
           CustomData_data_multiply(type, &max, 0.5f);
           CustomData_data_add(type, &min, &max);
 
-          /* snap CD (uv, vcol) points to their centroid */
+          /* Snap custom-data (UV, vertex-colors) points to their centroid. */
           while (!BLI_stack_is_empty(block_stack)) {
             void *block;
             BLI_stack_pop(block_stack, &block);

source/blender/bmesh/tools/bmesh_decimate_unsubdivide.c

@@ -229,14 +229,15 @@ void BM_mesh_decimate_unsubdivide_ex(BMesh *bm, const int iterations, const bool
 
 #ifdef USE_WALKER
       /* Walk over selected elements starting at active */
-      BMW_init(&walker,
-               bm,
-               BMW_CONNECTED_VERTEX,
-               ELE_VERT_TAG,
-               BMW_MASK_NOP,
-               BMW_MASK_NOP,
-               BMW_FLAG_NOP, /* don't use BMW_FLAG_TEST_HIDDEN here since we want to desel all */
-               BMW_NIL_LAY);
+      BMW_init(
+          &walker,
+          bm,
+          BMW_CONNECTED_VERTEX,
+          ELE_VERT_TAG,
+          BMW_MASK_NOP,
+          BMW_MASK_NOP,
+          BMW_FLAG_NOP, /* don't use #BMW_FLAG_TEST_HIDDEN here since we want to deselect all. */
+          BMW_NIL_LAY);
 
       BLI_assert(walker.order == BMW_BREADTH_FIRST);
       for (v = BMW_begin(&walker, v_first); v != NULL; v = BMW_step(&walker)) {

source/blender/draw/engines/eevee/eevee_private.h

@@ -837,7 +837,7 @@ typedef struct EEVEE_EffectsInfo {
   struct GPUTexture *bloom_upsample[MAX_BLOOM_STEP - 1];
   struct GPUTexture *unf_source_buffer; /* pointer copy */
   struct GPUTexture *unf_base_buffer;   /* pointer copy */
-  /* Not alloced, just a copy of a *GPUtexture in EEVEE_TextureList. */
+  /* Not allocated, just a copy of a *GPUtexture in EEVEE_TextureList. */
   struct GPUTexture *source_buffer;     /* latest updated texture */
   struct GPUFrameBuffer *target_buffer; /* next target to render to */
   struct GPUTexture *final_tx;          /* Final color to transform to display color space. */

source/blender/draw/engines/overlay/overlay_grid.cc

@@ -144,8 +144,8 @@ void OVERLAY_grid_init(OVERLAY_Data *vedata)
 
       zneg_flag = zpos_flag;
 
-      /* Persp : If camera is below floor plane, we switch clipping
-       * Ortho : If eye vector is looking up, we switch clipping */
+      /* Perspective: If camera is below floor plane, we switch clipping.
+       * Orthographic: If eye vector is looking up, we switch clipping. */
       if (((winmat[3][3] == 0.0f) && (campos[2] > 0.0f)) ||
           ((winmat[3][3] != 0.0f) && (zvec[2] < 0.0f))) {
         zpos_flag |= CLIP_ZPOS;

source/blender/draw/intern/draw_manager_data.cc

@@ -64,7 +64,7 @@
 
 static void draw_call_sort(DRWCommand *array, DRWCommand *array_tmp, int array_len)
 {
-  /* Count unique batches. Tt's not really important if
+  /* Count unique batches. It's not really important if
    * there is collisions. If there is a lot of different batches,
    * the sorting benefit will be negligible.
    * So at least sort fast! */
@@ -1527,7 +1527,7 @@ DRWCallBuffer *DRW_shgroup_call_buffer(DRWShadingGroup *shgroup,
   callbuf->count = 0;
 
   if (G.f & G_FLAG_PICKSEL) {
-    /* Not actually used for rendering but alloced in one chunk. */
+    /* Not actually used for rendering but allocated in one chunk. */
     if (inst_select_format.attr_len == 0) {
       GPU_vertformat_attr_add(&inst_select_format, "selectId", GPU_COMP_I32, 1, GPU_FETCH_INT);
     }
@@ -1557,7 +1557,7 @@ DRWCallBuffer *DRW_shgroup_call_buffer_instance(DRWShadingGroup *shgroup,
   callbuf->count = 0;
 
   if (G.f & G_FLAG_PICKSEL) {
-    /* Not actually used for rendering but alloced in one chunk. */
+    /* Not actually used for rendering but allocated in one chunk. */
     if (inst_select_format.attr_len == 0) {
       GPU_vertformat_attr_add(&inst_select_format, "selectId", GPU_COMP_I32, 1, GPU_FETCH_INT);
     }
@@ -2177,13 +2177,15 @@ static void draw_view_matrix_state_update(ViewInfos *storage,
   }
 
   /**
-   * If ortho : view_vecs[0] is the near-bottom-left corner of the frustum and
-   *            view_vecs[1] is the vector going from the near-bottom-left corner to
-   *            the far-top-right corner.
-   * If Persp : view_vecs[0].xy and view_vecs[1].xy are respectively the bottom-left corner
-   *            when Z = 1, and top-left corner if Z = 1.
-   *            view_vecs[0].z the near clip distance and view_vecs[1].z is the (signed)
-   *            distance from the near plane to the far clip plane.
+   * - When orthographic:
+   *   `view_vecs[0]` is the near-bottom-left corner of the frustum and
+   *   `view_vecs[1]` is the vector going from the near-bottom-left corner to
+   *   the far-top-right corner.
+   * - When perspective:
+   *   `view_vecs[0].xy` and `view_vecs[1].xy` are respectively the bottom-left corner
+   *   when Z = 1, and top-left corner if `Z = 1`.
+   *   `view_vecs[0].z` the near clip distance and `view_vecs[1].z` is the (signed)
+   *   distance from the near plane to the far clip plane.
    */
   copy_v3_v3(storage->viewvecs[0], view_vecs[0]);
 

source/blender/editors/mesh/editmesh_loopcut.c

@@ -473,7 +473,7 @@ static int loopcut_init(bContext *C, wmOperator *op, const wmEvent *event)
 
 static int ringcut_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 {
-  /* When accessed as a tool, get the active edge from the preselection gizmo. */
+  /* When accessed as a tool, get the active edge from the pre-selection gizmo. */
   {
     ARegion *region = CTX_wm_region(C);
     wmGizmoMap *gzmap = region->gizmo_map;

source/blender/editors/mesh/editmesh_polybuild.c

@@ -73,7 +73,7 @@ static void edbm_flag_disable_all_multi(const Scene *scene,
   MEM_freeN(objects);
 }
 
-/* When accessed as a tool, get the active edge from the preselection gizmo. */
+/** When accessed as a tool, get the active edge from the pre-selection gizmo. */
 static bool edbm_preselect_or_active(bContext *C, const View3D *v3d, Base **r_base, BMElem **r_ele)
 {
   ARegion *region = CTX_wm_region(C);

source/blender/editors/mesh/editmesh_select.cc

@@ -269,7 +269,7 @@ BMVert *EDBM_vert_find_nearest_ex(ViewContext *vc,
     uint index;
     BMVert *eve;
 
-    /* No afterqueue (yet), so we check it now, otherwise the bm_xxxofs indices are bad. */
+    /* No after-queue (yet), so we check it now, otherwise the bm_xxxofs indices are bad. */
     {
       DRW_select_buffer_context_create(bases, bases_len, SCE_SELECT_VERTEX);
 
@@ -495,7 +495,7 @@ BMEdge *EDBM_edge_find_nearest_ex(ViewContext *vc,
     uint index;
     BMEdge *eed;
 
-    /* No afterqueue (yet), so we check it now, otherwise the bm_xxxofs indices are bad. */
+    /* No after-queue (yet), so we check it now, otherwise the bm_xxxofs indices are bad. */
     {
       DRW_select_buffer_context_create(bases, bases_len, SCE_SELECT_EDGE);
 
@@ -877,7 +877,7 @@ static bool unified_findnearest(ViewContext *vc,
     } f, f_zbuf;
   } hit = {{nullptr}};
 
-  /* no afterqueue (yet), so we check it now, otherwise the em_xxxofs indices are bad */
+  /* No after-queue (yet), so we check it now, otherwise the em_xxxofs indices are bad. */
 
   if ((dist > 0.0f) && (em->selectmode & SCE_SELECT_FACE)) {
     float dist_center = 0.0f;
@@ -3225,7 +3225,7 @@ static void select_linked_delimit_begin(BMesh *bm, int delimit)
     }
   }
 
-  /* grr, shouldn't need to alloc BMO flags here */
+  /* Shouldn't need to allocated BMO flags here (sigh). */
   BM_mesh_elem_toolflags_ensure(bm);
 
   {
@@ -4199,7 +4199,7 @@ static void walker_deselect_nth(BMEditMesh *em,
       break;
   }
 
-  /* grr, shouldn't need to alloc BMO flags here */
+  /* Shouldn't need to allocate BMO flags here (sigh). */
   BM_mesh_elem_toolflags_ensure(bm);
 
   /* Walker restrictions uses BMO flags, not header flags,
@@ -4218,7 +4218,7 @@ static void walker_deselect_nth(BMEditMesh *em,
            mask_vert,
            mask_edge,
            mask_face,
-           BMW_FLAG_NOP, /* don't use BMW_FLAG_TEST_HIDDEN here since we want to desel all */
+           BMW_FLAG_NOP, /* Don't use #BMW_FLAG_TEST_HIDDEN here since we want to deselect all. */
            BMW_NIL_LAY);
 
   /* use tag to avoid touching the same verts twice */

source/blender/editors/space_view3d/view3d_gizmo_preselect_type.cc

@@ -3,7 +3,7 @@
 /** \file
  * \ingroup wm
  *
- * \name Preselection Gizmo
+ * \name Pre-selection Gizmo
  *
  * Use for tools to hover over data before activation.
  *

source/blender/makesdna/DNA_particle_types.h

@@ -279,7 +279,7 @@ typedef struct ParticleSettings {
   struct PartDeflect *pd;
   struct PartDeflect *pd2;
 
-  /* modified dm support */
+  /* Evaluated mesh support. */
   short use_modifier_stack;
   char _pad5[2];
 

source/blender/makesrna/intern/rna_define.c

@@ -916,8 +916,8 @@ StructRNA *RNA_def_struct_ptr(BlenderRNA *brna, const char *identifier, StructRN
   DefRNA.laststruct = srna;
 
   if (srnafrom) {
-    /* copy from struct to derive stuff, a bit clumsy since we can't
-     * use MEM_dupallocN, data structs may not be alloced but builtin */
+    /* Copy from struct to derive stuff, a bit clumsy since we can't
+     * use #MEM_dupallocN, data structs may not be allocated but builtin. */
     memcpy(srna, srnafrom, sizeof(StructRNA));
     srna->cont.prophash = NULL;
     BLI_listbase_clear(&srna->cont.properties);

source/blender/makesrna/intern/rna_particle.c

@@ -3431,7 +3431,7 @@ static void rna_def_particle_settings(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Loop Count", "Number of times the keys are looped");
   RNA_def_property_update(prop, 0, "rna_Particle_redo");
 
-  /* modified dm support */
+  /* Evaluated mesh support. */
   prop = RNA_def_property(srna, "use_modifier_stack", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "use_modifier_stack", 0);
   RNA_def_property_ui_text(

source/blender/modifiers/intern/MOD_particlesystem.cc

@@ -123,7 +123,7 @@ static void deformVerts(ModifierData *md,
     }
   }
 
-  /* clear old dm */
+  /* Clear old evaluated mesh. */
   bool had_mesh_final = (psmd->mesh_final != nullptr);
   if (psmd->mesh_final) {
     BKE_id_free(nullptr, psmd->mesh_final);