Selectable: Internals: removed unused ImGuiSelectableFlags_DrawHoveredWhenHeld flag.

Needlessly introduced in baae057 from WIP tables branch at the time, ended up unused by Tables.
A comment "I find it counter intuitive that hovering supersedes activation." in #3516 led me to this however this is not the cause of said issue.

Author: ocornut

imgui_internal.h

@@ -890,10 +890,9 @@ enum ImGuiSelectableFlagsPrivate_
     ImGuiSelectableFlags_SelectOnClick          = 1 << 22,  // Override button behavior to react on Click (default is Click+Release)
     ImGuiSelectableFlags_SelectOnRelease        = 1 << 23,  // Override button behavior to react on Release (default is Click+Release)
     ImGuiSelectableFlags_SpanAvailWidth         = 1 << 24,  // Span all avail width even if we declared less for layout purpose. FIXME: We may be able to remove this (added in 6251d379, 2bcafc86 for menus)
-    ImGuiSelectableFlags_DrawHoveredWhenHeld    = 1 << 25,  // Always show active when held, even is not hovered. This concept could probably be renamed/formalized somehow.
-    ImGuiSelectableFlags_SetNavIdOnHover        = 1 << 26,  // Set Nav/Focus ID on mouse hover (used by MenuItem)
-    ImGuiSelectableFlags_NoPadWithHalfSpacing   = 1 << 27,  // Disable padding each side with ItemSpacing * 0.5f
-    ImGuiSelectableFlags_NoSetKeyOwner          = 1 << 28,  // Don't set key/input owner on the initial click (note: mouse buttons are keys! often, the key in question will be ImGuiKey_MouseLeft!)
+    ImGuiSelectableFlags_SetNavIdOnHover        = 1 << 25,  // Set Nav/Focus ID on mouse hover (used by MenuItem)
+    ImGuiSelectableFlags_NoPadWithHalfSpacing   = 1 << 26,  // Disable padding each side with ItemSpacing * 0.5f
+    ImGuiSelectableFlags_NoSetKeyOwner          = 1 << 27,  // Don't set key/input owner on the initial click (note: mouse buttons are keys! often, the key in question will be ImGuiKey_MouseLeft!)
 };
 
 // Extend ImGuiTreeNodeFlags_

imgui_widgets.cpp

@@ -6370,8 +6370,6 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
         g.LastItemData.StatusFlags |= ImGuiItemStatusFlags_ToggledSelection;
 
     // Render
-    if (held && (flags & ImGuiSelectableFlags_DrawHoveredWhenHeld))
-        hovered = true;
     if (hovered || selected)
     {
         const ImU32 col = GetColorU32((held && hovered) ? ImGuiCol_HeaderActive : hovered ? ImGuiCol_HeaderHovered : ImGuiCol_Header);