D15085: Fix numbers jumping in edit voxel size widget

Introduces an option for BKE_unit_value_as_string to skip stripping of zeroes, thus reducing flickering when using edit voxel size widget.

{F13125416}

Reviewed By: Julien Kaspar & Joseph Eagar
Differential Revision: https://developer.blender.org/D15085
Ref D15085

source/blender/blenkernel/intern/unit.c

@@ -460,11 +460,19 @@ static size_t unit_as_string(char *str,
   }
 
   double value_conv = (value / unit->scalar) - unit->bias;
+  bool strip_skip;
 
   /* Adjust precision to expected number of significant digits.
    * Note that here, we shall not have to worry about very big/small numbers, units are expected
    * to replace 'scientific notation' in those cases. */
   prec -= integer_digits_d(value_conv);
+
+  /* Negative precision is used to disable stripping of zeroes. This reduces text jumping when changing values. */
+  if (prec < 0) {
+  strip_skip = true;
+  prec *= -1;
+  }
+
   CLAMP(prec, 0, 6);
 
   /* Convert to a string. */
@@ -478,8 +486,10 @@ static size_t unit_as_string(char *str,
   size_t i = len - 1;
 
   if (prec > 0) {
-    while (i > 0 && str[i] == '0') { /* 4.300 -> 4.3 */
-      str[i--] = pad;
+    if (!strip_skip) {
+      while (i > 0 && str[i] == '0') { /* 4.300 -> 4.3 */
+        str[i--] = pad;
+      }
     }
 
     if (i > 0 && str[i] == '.') { /* 10. -> 10 */

source/blender/editors/object/object_remesh.cc

@@ -344,7 +344,7 @@ static void voxel_size_edit_draw(const bContext *C, ARegion *UNUSED(ar), void *a
   BKE_unit_value_as_string(str,
                            VOXEL_SIZE_EDIT_MAX_STR_LEN,
                            (double)(cd->voxel_size * unit->scale_length),
-                           4,
+                           -3,
                            B_UNIT_LENGTH,
                            unit,
                            true);