DatePicker disabled color

[Pcothren]

Issue

DatePicker is using disable text color to color the button. This prevents the user from being able to change the selected dates color without also changing the inactive date color.

implot/implot.cpp

Lines 3881 to 3886 in e64df65

	ImGui::PushStyleColor(ImGuiCol_Button, ImVec4(0,0,0,0));
	ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0,0));
	ImGuiStyle& style = ImGui::GetStyle();
	ImVec4 col_txt = style.Colors[ImGuiCol_Text];
	ImVec4 col_dis = style.Colors[ImGuiCol_TextDisabled];

implot/implot.cpp

Line 3972 in e64df65

ImGui::PushStyleColor(ImGuiCol_Button, col_dis);

implot/implot.cpp

Line 4022 in e64df65

ImGui::PushStyleColor(ImGuiCol_Button, col_dis);

implot/implot.cpp

Line 4060 in e64df65

ImGui::PushStyleColor(ImGuiCol_Button, col_dis);

Suggested Fix

separate selected date button color and disabled date text color. Allowing better integration with themes and more freedom for the user.