Begin: moved tooltip position code in an else block. Misc comments

imgui.cpp

@@ -5890,10 +5890,9 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
             ImRect rect_to_avoid(window->PosFloat.x - 1, window->PosFloat.y - 1, window->PosFloat.x + 1, window->PosFloat.y + 1);
             window->PosFloat = FindBestWindowPosForPopup(window->PosFloat, window->Size, &window->AutoPosLastDirection, rect_to_avoid);
         }
-
-        // Position tooltip (always follows mouse)
-        if ((flags & ImGuiWindowFlags_Tooltip) != 0 && !window_pos_set_by_api && !window_is_child_tooltip)
+        else  if ((flags & ImGuiWindowFlags_Tooltip) != 0 && !window_pos_set_by_api && !window_is_child_tooltip)
         {
+            // Position tooltip (always follow mouse but avoid cursor)
             float sc = g.Style.MouseCursorScale;
             ImVec2 ref_pos = (!g.NavDisableHighlight && g.NavDisableMouseHover) ? NavCalcPreferredMousePos() : g.IO.MousePos;
             ImRect rect_to_avoid;

imgui_draw.cpp

@@ -1733,7 +1733,7 @@ bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
         IM_ASSERT(cfg.DstFont && (!cfg.DstFont->IsLoaded() || cfg.DstFont->ContainerAtlas == atlas));
 
         const int font_offset = stbtt_GetFontOffsetForIndex((unsigned char*)cfg.FontData, cfg.FontNo);
-        IM_ASSERT(font_offset >= 0);
+        IM_ASSERT(font_offset >= 0 && "FontData is incorrect, or FontNo cannot be found.");
         if (!stbtt_InitFont(&tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
         {
             atlas->TexWidth = atlas->TexHeight = 0; // Reset output on failure