tab button hovering style is not working

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Hi,

I am trying to set the tab button and text to change their color when hovered.

So far I got this:

```
/* tab button */
button = &style->tab.tab_minimize_button;
nk_zero_struct(*button);
button->normal = nk_style_item_color(nk_rgb(255,0,0)); /* RED */
button->hover = nk_style_item_color(nk_rgb(0,255,0)); /* GREEN */
button->active = nk_style_item_color(nk_rgb(0,0,255)); /* BLUE */
button->border_color = nk_rgb(0,0,255);
button->text_background = table[NK_COLOR_TAB_HEADER];
button->text_normal = nk_rgb(0,0,255); /* BLUE */
button->text_hover = nk_rgb(0,255,0); /* GREEN */

```

I do get the blue arrow and red square:


However, when i hover these elements (or the tab) with the mouse cursor, they do not turn green. How can this be fixed?

Thanks,

Note: Linux, glfw_opengl2

Start with the tab_minimize_button styling shown in the issue and reproduce it using the glfw_opengl2 setup. Trace how hover state is handled for the tab button and its text; the issue is done when hovering the tab elements visibly applies the configured green colors.

Written by the indexing model from the issue text.