Code simplifications found by cppcheck

They are based on:
- Boolean arithmetic simplifications
- setting variables that are not accessed
- constant variables

3 files changed, 2 insertions, 6 deletions

diff --git a/scene/gui/color_picker.cpp b/scene/gui/color_picker.cpp
index 724e5bcaf6..66c790b0d9 100644
--- a/scene/gui/color_picker.cpp
+++ b/scene/gui/color_picker.cpp
@@ -959,7 +959,7 @@ void ColorPicker::_sample_draw() {
 		// Draw both old and new colors for easier comparison (only if spawned from a ColorPickerButton).
 		const Rect2 rect_old = Rect2(Point2(), Size2(sample->get_size().width * 0.5, sample->get_size().height * 0.95));
 
-		if (display_old_color && old_color.a < 1.0) {
+		if (old_color.a < 1.0) {
 			sample->draw_texture_rect(get_theme_icon(SNAME("sample_bg"), SNAME("ColorPicker")), rect_old, true);
 		}
 
diff --git a/scene/gui/split_container.cpp b/scene/gui/split_container.cpp
index 2ca1d6239e..9830b41389 100644
--- a/scene/gui/split_container.cpp
+++ b/scene/gui/split_container.cpp
@@ -71,7 +71,7 @@ void SplitContainerDragger::gui_input(const Ref<InputEvent> &p_event) {
 
 		Vector2i in_parent_pos = get_transform().xform(mm->get_position());
 		if (!sc->vertical && is_layout_rtl()) {
-			sc->split_offset = drag_ofs - ((sc->vertical ? in_parent_pos.y : in_parent_pos.x) - drag_from);
+			sc->split_offset = drag_ofs - (in_parent_pos.x - drag_from);
 		} else {
 			sc->split_offset = drag_ofs + ((sc->vertical ? in_parent_pos.y : in_parent_pos.x) - drag_from);
 		}
@@ -194,7 +194,6 @@ void SplitContainer::_compute_middle_sep(bool p_clamp) {
 	// Clamp the split_offset if requested.
 	if (p_clamp) {
 		split_offset -= wished_middle_sep - middle_sep;
-		p_clamp = false;
 	}
 }
 
diff --git a/scene/gui/tab_bar.cpp b/scene/gui/tab_bar.cpp
index cf6681f809..f87829cf71 100644
--- a/scene/gui/tab_bar.cpp
+++ b/scene/gui/tab_bar.cpp
@@ -385,9 +385,6 @@ void TabBar::_notification(int p_what) {
 					if (tabs[i].disabled) {
 						sb = theme_cache.tab_disabled_style;
 						col = theme_cache.font_disabled_color;
-					} else if (i == current) {
-						sb = theme_cache.tab_selected_style;
-						col = theme_cache.font_selected_color;
 					} else {
 						sb = theme_cache.tab_unselected_style;
 						col = theme_cache.font_unselected_color;