Tables: fixed TableGetHoveredRow() (#7350, #6588, #6250) + TableGetRowIndex() which never correctly worked when using a clipper.

Amend e09454aec. Can't understand the comment nor why code was commented. Code looks alright. Compared TableEndRow() between 1.80 and current as well.

docs/CHANGELOG.txt

@@ -46,6 +46,11 @@ Other Changes:
 - Windows: fixed an issue where resizable child windows would emit border
   logic when hidden/non-visible (e.g. when in a docked window that is not
   selected), impacting code not checking for BeginChild() return value. (#8815)
+- Tables: fixed TableGetRowIndex() which never correctly worked when using
+  a clipper (it exists for consistency but is almost never used, as it is 
+  often more convenient to use index in caller-code, whereas TableGetRowIndex()
+  includes header rows). 
+- Tables: fixed imgui_internal.h's TableGetHoveredRow() the same way. (#7350, #6588, #6250)
 - Error Handling: minor improvements to error handling for TableGetSortSpecs()
   and TableSetBgColor() calls. (#1651, #8499)
 - Misc: fixed building with IMGUI_DISABLE_DEBUG_TOOLS only. (#8796)

imgui.cpp

@@ -3125,7 +3125,7 @@ static void ImGuiListClipper_SeekCursorAndSetupPrevLine(float pos_y, float line_
             ImGui::TableEndRow(table);
         table->RowPosY2 = window->DC.CursorPos.y;
         const int row_increase = (int)((off_y / line_height) + 0.5f);
-        //table->CurrentRow += row_increase; // Can't do without fixing TableEndRow()
+        table->CurrentRow += row_increase;
         table->RowBgColorCounter += row_increase;
     }
 }

imgui.h

@@ -916,7 +916,7 @@ namespace ImGui
     IMGUI_API ImGuiTableSortSpecs*  TableGetSortSpecs();                        // get latest sort specs for the table (NULL if not sorting).  Lifetime: don't hold on this pointer over multiple frames or past any subsequent call to BeginTable().
     IMGUI_API int                   TableGetColumnCount();                      // return number of columns (value passed to BeginTable)
     IMGUI_API int                   TableGetColumnIndex();                      // return current column index.
-    IMGUI_API int                   TableGetRowIndex();                         // return current row index.
+    IMGUI_API int                   TableGetRowIndex();                         // return current row index (header rows are accounted for)
     IMGUI_API const char*           TableGetColumnName(int column_n = -1);      // return "" if column didn't have a name declared by TableSetupColumn(). Pass -1 to use current column.
     IMGUI_API ImGuiTableColumnFlags TableGetColumnFlags(int column_n = -1);     // return column flags so you can query their Enabled/Visible/Sorted/Hovered status flags. Pass -1 to use current column.
     IMGUI_API void                  TableSetColumnEnabled(int column_n, bool v);// change user accessible enabled/disabled state of a column. Set to false to hide the column. User can use the context menu to change this themselves (right-click in headers, or right-click in columns body with ImGuiTableFlags_ContextMenuInBody)