Tables: Made it possible to use SameLine(0,0) after TableNextColumn() or TableSetColumnIndex() in order to reuse line height from previous cell.

docs/CHANGELOG.txt

@@ -44,6 +44,8 @@ Breaking changes:
 
 Other changes:
 
+- Tables: Made it possible to use SameLine(0,0) after TableNextColumn() or
+  TableSetColumnIndex() in order to reuse line height from previous cell. (#3740)
 - Nav, TreeNode: Pressing Left with ImGuiTreeNodeFlags_NavLeftJumpsBackHere now goes
   through proper navigation logic: honor scrolling and selection. (#1079, #1131)
 - Sliders: Fixed an integer overflow and div-by-zero in SliderInt() when

imgui.h

@@ -26,7 +26,7 @@
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
 #define IMGUI_VERSION       "1.89.9 WIP"
-#define IMGUI_VERSION_NUM   18982
+#define IMGUI_VERSION_NUM   18983
 #define IMGUI_HAS_TABLE
 
 /*

imgui_demo.cpp

@@ -4766,7 +4766,7 @@ static void ShowDemoWindowTables()
     if (ImGui::TreeNode("Row height"))
     {
         HelpMarker("You can pass a 'min_row_height' to TableNextRow().\n\nRows are padded with 'style.CellPadding.y' on top and bottom, so effectively the minimum row height will always be >= 'style.CellPadding.y * 2.0f'.\n\nWe cannot honor a _maximum_ row height as that would require a unique clipping rectangle per row.");
-        if (ImGui::BeginTable("table_row_height", 1, ImGuiTableFlags_BordersOuter | ImGuiTableFlags_BordersInnerV))
+        if (ImGui::BeginTable("table_row_height", 1, ImGuiTableFlags_Borders))
         {
             for (int row = 0; row < 10; row++)
             {
@@ -4777,6 +4777,28 @@ static void ShowDemoWindowTables()
             }
             ImGui::EndTable();
         }
+
+        HelpMarker("Showcase using SameLine(0,0) to share Current Line Height between cells.\n\nPlease note that Tables Row Height is not the same thing as Current Line Height, as a table cell may contains multiple lines.");
+        if (ImGui::BeginTable("table_share_lineheight", 2, ImGuiTableFlags_Borders))
+        {
+            ImGui::TableNextRow();
+            ImGui::TableNextColumn();
+            ImGui::ColorButton("##1", ImVec4(0.13f, 0.26f, 0.40f, 1.0f), ImGuiColorEditFlags_None, ImVec2(40, 40));
+            ImGui::TableNextColumn();
+            ImGui::Text("Line 1");
+            ImGui::Text("Line 2");
+
+            ImGui::TableNextRow();
+            ImGui::TableNextColumn();
+            ImGui::ColorButton("##2", ImVec4(0.13f, 0.26f, 0.40f, 1.0f), ImGuiColorEditFlags_None, ImVec2(40, 40));
+            ImGui::TableNextColumn();
+            ImGui::SameLine(0.0f, 0.0f); // Reuse line height from previous column
+            ImGui::Text("Line 1, with SameLine(0,0)");
+            ImGui::Text("Line 2");
+
+            ImGui::EndTable();
+        }
+
         ImGui::TreePop();
     }
 

imgui_tables.cpp

@@ -1779,7 +1779,7 @@ void ImGui::TableBeginRow(ImGuiTable* table)
     table->RowTextBaseline = 0.0f;
     table->RowIndentOffsetX = window->DC.Indent.x - table->HostIndentX; // Lock indent
     window->DC.PrevLineTextBaseOffset = 0.0f;
-    window->DC.CurrLineSize = ImVec2(0.0f, 0.0f);
+    window->DC.PrevLineSize = window->DC.CurrLineSize = ImVec2(0.0f, 0.0f); // This allows users to call SameLine() to share LineSize between columns, and to call it from first column too.
     window->DC.IsSameLine = window->DC.IsSetPos = false;
     window->DC.CursorMaxPos.y = next_y1;
 
@@ -2016,6 +2016,7 @@ void ImGui::TableBeginCell(ImGuiTable* table, int column_n)
     window->DC.CursorPos.y = table->RowPosY1 + table->CellPaddingY;
     window->DC.CursorMaxPos.x = window->DC.CursorPos.x;
     window->DC.ColumnsOffset.x = start_x - window->Pos.x - window->DC.Indent.x; // FIXME-WORKRECT
+    window->DC.CursorPosPrevLine = window->DC.CursorPos; // This allows users to call SameLine() to share LineSize between columns.
     window->DC.CurrLineTextBaseOffset = table->RowTextBaseline;
     window->DC.NavLayerCurrent = (ImGuiNavLayer)column->NavLayerCurrent;