InputTextMultiline(): multi-line selection draw fix (#200)

imgui.cpp

@@ -7144,7 +7144,7 @@ static bool InputTextEx(const char* label, char* buf, size_t buf_size, const ImV
             for (const ImWchar* p = text_selected_begin; p < text_selected_end; )
             {
                 ImVec2 rect_size = CalcTextSizeW(edit_state.Font, edit_state.FontSize, FLT_MAX, p, text_selected_end, &p, NULL, true);
-                ImRect rect(render_pos + rect_pos + ImVec2(-edit_state.ScrollX, -font_offy_up), render_pos + rect_pos + ImVec2(rect_size.x - edit_state.ScrollX, +font_offy_dn));
+                ImRect rect(render_pos + rect_pos + ImVec2(-edit_state.ScrollX, (p == text_selected_begin) ? -font_offy_up : -g.FontSize), render_pos + rect_pos + ImVec2(rect_size.x - edit_state.ScrollX, (p == text_selected_end) ? +font_offy_dn : 0.0f));
                 rect.Clip(clip_rect);
                 window->DrawList->AddRectFilled(rect.Min, rect.Max, font_color);
                 rect_pos.x = 0.0f;