Tab Bar: Fixed minor/unlikely bug skipping over a button when scrolling left with arrows + InputText: minor optimization.

docs/CHANGELOG.txt

@@ -59,6 +59,7 @@ Other Changes:
 - Tab Bar: Made it possible to append to an existing tab bar by calling BeginTabBar()/EndTabBar() again.
 - Tab Bar: Fixed using more than 128 tabs in a tab bar (scrolling policy recommended).
 - Tab Bar: Do not display a tooltip if the name already fits over a given tab. (#3521)
+- Tab Bar: Fixed minor/unlikely bug skipping over a button when scrolling left with arrows.
 - Drag and Drop: Fix losing drop source ActiveID (and often source tooltip) when opening a TreeNode()
   or CollapsingHeader() while dragging. (#1738)
 - Drag and Drop: Fix drag and drop to tie same-size drop targets by choosen the later one. Fixes dragging

imgui_widgets.cpp

@@ -4275,8 +4275,8 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                     IM_ASSERT(callback_data.Flags == flags);
                     const bool buf_dirty = callback_data.BufDirty;
                     if (callback_data.CursorPos != utf8_cursor_pos || buf_dirty)            { state->Stb.cursor = ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.CursorPos); state->CursorFollow = true; }
-                    if (callback_data.SelectionStart != utf8_selection_start || buf_dirty)  { state->Stb.select_start = ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.SelectionStart); }
+                    if (callback_data.SelectionStart != utf8_selection_start || buf_dirty)  { state->Stb.select_start = (callback_data.SelectionStart == callback_data.CursorPos) ? state->Stb.cursor : ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.SelectionStart); }
-                    if (callback_data.SelectionEnd != utf8_selection_end || buf_dirty)      { state->Stb.select_end = ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.SelectionEnd); }
+                    if (callback_data.SelectionEnd != utf8_selection_end || buf_dirty)      { state->Stb.select_end = (callback_data.SelectionEnd == callback_data.SelectionStart) ? state->Stb.select_start : ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.SelectionEnd); }
                     if (buf_dirty)
                     {
                         IM_ASSERT(callback_data.BufTextLen == (int)strlen(callback_data.Buf)); // You need to maintain BufTextLen if you change the text!
@@ -7388,7 +7388,7 @@ static ImGuiTabItem* ImGui::TabBarScrollingButtons(ImGuiTabBar* tab_bar)
                 {
                     target_order += select_dir;
                     selected_order += select_dir;
-                    tab_to_scroll_to = (target_order <= 0 || target_order >= tab_bar->Tabs.Size) ? tab_to_scroll_to : NULL;
+                    tab_to_scroll_to = (target_order < 0 || target_order >= tab_bar->Tabs.Size) ? tab_to_scroll_to : NULL;
                 }
             }
         }