extjs750 window标题工具按钮图标不显示异常处理

extjs7.x classic material主题

修正前，window标题中关闭图标可见，tools图标看不见

修正后，tools正常显示图标

检查元素发现图标样式继承了neutral主题.x-tool-tool-el样式的颜色，查阅源码可知material继承neutral主题却没有为window的tools定义样式

自定义样式

.#{$prefix}window {
  .#{$prefix}window-header {
    .#{$prefix}tool-tool-el {
      color: $base-color;
    }
    .#{$prefix}tool-close {
      color: $window-close-glyph-color;
    }
  }
}

• neutral主题panel tool样式 node_modules/@sencha/ext-classic-theme-neutral/sass/src/panel/Tool.scss

.#{$prefix}tool-tool-el {
    overflow: hidden;
    width: $tool-size;
    height: $tool-size;
    margin: 0;
    color: $tool-glyph-color; // $tool-glyph-color: dynamic(#fff);
    text-align: center;
    @if $tool-opacity != 1 {
        @include opacity($tool-opacity);
    }
    @if $tool-opacity-over != 1 or $tool-opacity != 1 {
        .#{$prefix}tool-over & {
            @include opacity($tool-opacity-over);
        }
    }
    @if $tool-opacity-pressed != 1 or $tool-opacity != 1 {
        .#{$prefix}tool-pressed & {
            @include opacity($tool-opacity-pressed);
        }
    }
}

• material主题windows样式 node_modules/@sencha/ext-classic-theme-material/sass/src/window/Window.scss

.#{$prefix}window {
    box-shadow: $toolbar-box-shadow;
    .#{$prefix}window-header {
        .#{$prefix}tool-close {
            color: $window-close-glyph-color;
        }
    }
}