Adds a solid, double-thickness line under lint errors, instead of the standard thin dotted line:

atom-text-editor.editor .linter-row {
/* Take up the full allowed width */
left: 0;
right: 0;
/* Align the linter dot in the middle */
display: flex;
align-items: center;
justify-content: center;
}

atom-text-editor.editor .linter-highlight, .linter-highlight {
.error_type(@color, @priority) {
.region {
border-bottom: 2px solid @color !important;
}
}
.warning_type(@color, @priority) {
.region {
border-bottom: 2px solid @color !important;
}
}
&.linter-info {
.error_type(@background-color-info, -1);
}
&.linter-warning {
.error_type(@background-color-warning, 0);
}
&.linter-error {
.error_type(@background-color-error, 1);
}
}

.tree-view {
.error_type(@color) {
border-bottom: 2px solid @color !important;
}
.linter-info {
.error_type(@background-color-info);
}
.linter-warning {
.error_type(@background-color-warning);
}
.linter-error {
.error_type(@background-color-error);
}
}