Fonts: Added a bit of user facing tooling.

imgui.cpp

@@ -15594,6 +15594,7 @@ void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
 {
     ImGuiContext& g = *GImGui;
 
+    SeparatorText("Fonts");
     Text("Read ");
     SameLine(0, 0);
     TextLinkOpenURL("https://www.dearimgui.com/faq/");
@@ -15641,6 +15642,28 @@ void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
         PopID();
     }
 
+    SeparatorText("Font Atlas");
+    if (Button("Clear Cache"))
+        atlas->ClearCache();
+    SameLine();
+    if (Button("Grow"))
+        ImFontAtlasBuildGrowTexture(atlas);
+    SameLine();
+    if (Button("Compact"))
+        ImFontAtlasBuildCompactTexture(atlas);
+
+    for (int tex_n = 0; tex_n < atlas->TexList.Size; tex_n++)
+    {
+        ImTextureData* tex = atlas->TexList[tex_n];
+        if (tex_n > 0)
+            SameLine();
+        Text("Tex: %dx%d", tex->Width, tex->Height);
+    }
+    const int packed_surface_sqrt = (int)sqrtf((float)atlas->Builder->RectsPackedSurface);
+    const int discarded_surface_sqrt = (int)sqrtf((float)atlas->Builder->RectsDiscardedSurface);
+    Text("Packed rects: %d, area: about %d px ~%dx%d px", atlas->Builder->RectsPackedCount, atlas->Builder->RectsPackedSurface, packed_surface_sqrt, packed_surface_sqrt);
+    Text("incl. Discarded rects: %d, area: about %d px ~%dx%d px", atlas->Builder->RectsDiscardedCount, atlas->Builder->RectsDiscardedSurface, discarded_surface_sqrt, discarded_surface_sqrt);
+
     // Texture list
     for (ImTextureData* tex : atlas->TexList)
     {

imgui_demo.cpp

@@ -8446,11 +8446,11 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
         {
             ImGuiIO& io = GetIO();
             ImFontAtlas* atlas = io.Fonts;
-            HelpMarker("Read FAQ and docs/FONTS.md for details on font loading.");
             ShowFontAtlas(atlas);
 
             // Post-baking font scaling. Note that this is NOT the nice way of scaling fonts, read below.
             // (we enforce hard clamping manually as by default DragFloat/SliderFloat allows CTRL+Click text to get out of bounds).
+            SeparatorText("Legacy Scaling");
             const float MIN_SCALE = 0.3f;
             const float MAX_SCALE = 2.0f;
             HelpMarker(